The best time to visit Seixal is during the late spring, summer, and early autumn months, from May to October, when the weather is consistently warm and sunny, superb for enjoying the coastal activities.May and June offer pleasant temperatures and fewer crowds, making it ideal for those who prefer a more relaxed experience. The lush landscapes are at their most vibrant, and the sea is warm enough for swimming.July and August are the peak summer months, with the warmest weather and plenty of sunshine, making it superb for beach lovers and watersports enthusiasts. While it's the busiest time, Seixal generally retains a relaxed feel compared to some of the island's larger towns.September and October still provide lovely warm weather and fewer visitors than the height of summer.